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arXiv 1609.08358cond-mat.str-el
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FeGe helimagnet中自旋波动力学的小角中子散射研究

Spin-wave dynamics in FeGe helimagnet: studied by small-angle neutron scattering

S. -A. Siegfried, A. S. Sukhanov, E. V. Altynbaev, D. Honnecker, A. Heinemann, A. V. Tsvyashchenko, S. V. Grigoriev

摘要:

用中子小角散射方法研究了225~ $T_C \approx$ ~278.7 K温度范围内Dzyaloshinskiii-Moriya helimagnet FeGe的自旋波刚度。我们所用的方法是基于[S. V. Grigoriev et al. Phys. Rev. \textbf{92} 220415(R)(2015)],并在此扩展用于多晶样品中的应用。我们证实了由Dzyaloshinskiii-Moriya相互作用引起的FeGe各向异性自旋波色散的有效性。我们已经表明,自旋波刚度的FeGe helimagnet的$A$随温度的下降为$A(T) = 194(1-0.7(T/T_C)^{4.2})$毫微伏$^2$。在$T_C$上的自旋波刚度$A = 58$ meV_PDMATHABMQ的有限值将FeGe中的有序-无序相变分类为一阶相变。

英文摘要:

We have studied the spin-wave stiffness of the Dzyaloshinskii-Moriya helimagnet FeGe in a temperature range from 225~K up to $T_C \approx$~278.7~K by small-angle neutron scattering. The method we have used is based on [S. V. Grigoriev et al. Phys. Rev. B \textbf{92} 220415(R) (2015)] and was extended here for the application in polycrystalline samples. We confirm the validity of the anisotropic spin-wave dispersion for FeGe caused by the Dzyaloshinskii-Moriya interaction. We have shown that the spin-wave stiffness $A$ for FeGe helimagnet decreases with a temperature as $A(T) = 194(1-0.7(T/T_C)^{4.2})$ meVÅ$^2$. The finite value of the spin-wave stiffness $A = 58$ meVÅ$^2$ at $T_C$ classifies the order-disorder phase transition in FeGe as being the first order one.

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